Feruchemy

[Xiahida Pahn Kahl]

What shard influences Feruchemy and why have we not seen them on Scadrial?

[alder24 Elantrian]

It's both Ruin and Preservation. Invested art are manifestations of Shardic influence in a system, they are not made by them, they just appear, because of interactions between Shards and a system/planet.

Spoiler

UndertakerSheep

If I remember correctly, Allomancy is from Preservation, Hemalurgy is from Ruin and Feruchemy is from both Preservation and Ruin.

legobmw99

This is correct. It isn't caused by a shard, but the interaction of two opposing shards

[...]

General Reddit 2016 (Aug. 20, 2016)

 

Spoiler

Questioner

Allomancy is of Preservation, correct?

Brandon Sanderson

Yes...

Questioner

What are Feruchemy and Hemalurgy of?

Brandon Sanderson

Hemalurgy is definitely of Ruin.

Questioner

Is it of pure Ruin?

Brandon Sanderson

Yes. That's a very Ruin thing. And Feruchemy is more of a blend. Though… there is more philosophy to that and human construct—like the Allomantic table—than I think I’ve made clear before.

Shadows of Self Chicago signing (Oct. 12, 2015)